Bagatelle No. 25 in A minor for solo piano, commonly known as "Für Elise", is one of Ludwig van Beethoven's most significant popular compositions. It was not published during his lifetime, only being discovered 40 years after his death, and may be termed either a Bagatelle or an Albumblatt. The identity of "Elise" is unknown; researchers have suggested Therese Malfatti, Elisabeth Röckel, or Elise Barensfeld.